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Maximum Storm Drain Pipe Flow Rate Pipe Flow Rate

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Fluids Flow Engineering and Design

Maximum Storm Drain Pipe Flow Rate per. International Plumbing Code (IPC 2018) Table 1106.2

Pipe Size I.D.
(inches)
Flow Capacity (gpm)
Vertical Drain Orientation
Horizontal Drain Pipe Angle / Slope
1 / 16 inch per foot
1 / 8 inch per foot
1 / 4 inch per foot
1 / 2 inch per foot
2
34
15
22
31
44
3
87
39
55
79
111
4
180
81
115
163
231
5
311
117
165
234
331
6
538
243
344
487
689
8
1,117
505
714
1,010
1,429
10
2,050
927
1,311
1,855
2,623
12
3,272
1,480
2,093
2,960
4,187
15
5,543
2,508
3,546
5,016
7,093

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 3.785 L/m.

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